1985 with an Expanded Story on Electronics in Photography That Everyone Should Read
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of Electronics News and Tips RdìO._ 134 that'llpages change your every -day life Electronucsi co CO $2.50-US/$2.05-CANADA Home ELECTRONICS in Control PHOTOGRAPHY Computer NIKOLA TESLA CABLE -TV DESCRAMBLING how to Design GERNSBACK DC POWER SUPPLIES PUBLICATION Exhaust Analyzer for your car [) C-DUAM Stereo-AM o Decoder ii TEK Now! Tek quality and expert advice are just a free phone call away! 100 MHz dual A/B sweep selec- time base scope. tion. Calibrated Easy -to -read CRT; Wide range verti- A sweeps from bright, full-sized cal sensitivity. Two 100 MHz, 50 ns/div to 8x10 cm; 14 kv Choose from high sensitivity 0.5 s/div; B sweeps accelerating 2 mV/div (lx channels. 3.5 ns from 50 ns/div B trigger slope potential complete probe) to 50 V/div risetime; do to to 50 ms/div; vari- and level. Use B with BEAM FIND, (10x probe); 100 MHz band- able control for up Dual time base trigger level to separate NB color -keyed for lx width from 5 V/div to 2.5 to 1 reduc- measurements. select B -triggered dual intensity and 10x probes; to 5 mV/div; tion and 10x Select either A or or run -after -delay controls, FOCUS variable control extended sen- magnification for B sweeps, or both modes; use B and TRACE increases scale sitivity of 2 mV/div sweeps to alternately with A TRIGGER SLOPE ROTATION. factor by 2.5 to 1. at 90 MHz. 5 ns/div. intensified by B. to select transitions. Our direct order line gets have the bandwidth for digital you the industry's leading and analog circuits. The sensitivity price/performance portables... for low signal measurements. The and fast answers from experts! sweep speeds for fast logic fami- manual, two 10X probes, 15 -day The 60 MHz single time base delay lies. And delayed sweep for fast, return policy and worldwide ser- 2213A, the 60 MHz dual time base accurate timing measurements. vice backup. 2215A and the 100 MHz dual time All scopes are UL Listed and CSA base 2235 offer unprecedented approved. Order toll free: reliability and affordability, plus the You can order, or obtain 1-800-426-2200, industry's first 3 -year warranty* literature, through the Tek on labor and parts, CRT included. National Marketing Center. Tech- Ask for Rick. In Oregon, call collect: The cost: just $1200 for the nical personnel, expert in scope 2213A, $1450 for the 2215A, applications, will answer your (503) 627-9000. $1650 for the 2235.1 Even at questions and expedite delivery. Or write Tektronix, Inc. these low prices, there's no Direct orders include comprehen- P.O. Box 1700 scrimping on performance. You sive 3 -year warranty*, operator's Beaverton, OR 97075 Tektronix COMMITTED TO EXCELLENCE Copyright ©1984. Tektronix. Inc. All rights reserved #TTA-439 tPrice FOB Beaverton, OR '3 -year warranty includes CRT EDITORIAL A Picture is Worth a Thousand Words! I I can remember the day when bracketed my photographic shots, plus and minus half -stops, to be sure that at least one of the negatives obtained would be good enough for making a black -and -white 5 x 7 print. Now I shoot with abandon! My camera measures the light, automatically selects the correct focus, fires the strobe, makes an exposure, and the results are fantastic full -color snaps available that same day. Electronics made it all possible. We can't cover all the electronics advancements in photography in one issue of a magazine, let alone in one issue of a thick book; but we open this issue of the Radio - Electronics Annual 1985 with an expanded story on electronics in photography that everyone should read. In fact, if you are a nostalgia buff, save this issue-we predict that ten years from today what we say here will be old hat as is the brownie camera of Grandma's day. Our cover displays three construction projects that, quite frankly, we hope will bring excitement to you as they did to us. CIRCLE 267 ON FREE INFORMATION CARD In fact, check out the contents page and discover a few other Radio - interesting project articles. We included a few macro projects Electronics that we know will get you thinking about designing your own projects Of course, the issue is packed with many other features- UAL the life and times of Nikola Tesla, cable -TV descrambling, STAFF designing power supplies, unique test equipment, inside logic Hugo Gernsback (1884-1967) founder in, and enjoy this issue analyzers, and a lot more. Dig friends, M. Harvey Gernsback, editor-in -chief of Radio -Electronics Annual 1985. Larry Steckler, CET, publisher Art Kleiman, editorial director Julian S. Martin, KA2GUN, editor Af. ,1,,c,,704'.. Carl Laron, associate editor Brian C. Fenton, assistant technical editor (244w.1Julian S. Martin, KA2GUN Ruby M. Yee, Editor production manager Robert A.W. Lowndes, production associate BUSINESS AND EDITORIAL OFFICES PACIFIC COAST Mountain States Karen S. Tucker, production associate Gernsback Publications, Inc. 200 Park Ave. South, New York, NY 10003 Marvin Green Dianne Osias, President: M. Harvey Gernsback Radio -Electronics production assistant Vice President: Larry Steckler 413 So. La Brea Ave. Los Angeles, Ca. 90036 Jacqueline Weaver, circulation director (213) 938-0166 Arline R. Fishman, ADVERTISING SALES MIDWEST/Texas/ advertising coordinator East Arkansas/Okla. Composition and interior design by Stanley Levitan Ralph Bergen Mates Graphics Radio -Electronics The Ralph Bergen Co. 200 Park Ave. South 540 Frontage Road-Suite 325 C) Y New York, NY 10003 Northfield, Illinois 60093 212-777-6400 312-446-1444 1 - Rádió Electróñçs) 1985 CONTENTS PAGE 21 ELECTRONICS IN PHOTOGRAPHY-all areas of photography have benefitted from the use of electronics in photographic equipment 21-Introduction 23-The All -Electronic Mavica 27-The New Disc Cameras 31-Auto Exposure and Auto Focus Systems 38-Photo Accessories 42-Electronics in the Darkroom 46 Audio Frequency Generator-designed with a quick -reading, digital readout 51 The Life and Times Of Nikola Tesla-he made possible much of what we take for granted today 59 C-QUAM AM Stereo Converter-one chip brings stereo to your AM receiver 65 Unique Test Equipment-a look at what's new, what's sophisticated, and what's unusual 71 Solid -State Barometer-state-of-the-art device you can build 75 How to Design Power Supplies-all about unregulated and regulated power supplies, and over- voltage protection circuits 79 Home Control Computer-it can do the job and free your home computer for other purposes 94 TRS-80 Telephone Dialer-go automatic with this program 95 Automotive Exhaust Analyzer-lets you tune up for emission requirements 107 Cable TV Descrambling-how they do it and undo it 111 Making Measurements Electronically-how transducers make it all possible 116 Upgrade Your Printer-add new features and flexibility 121 All About Logic Analyzers-the digital equivalent to the oscilloscope MACRO PROJECTS 106 Sliding -Tone Doorbell 106 Plant -Water Monitor 130 Crystal Tester DEPARTMENTS 1 Editorial-one picture is worth a thousand words! 4 New Products-hot items in the marketplace 14 Equipment Reports 14-Ungar Electronic Soldering Iron System 9000 14-Regency Programmable Scanner Model Z30 127-Triplett Model 3500 Autorange Digital Meter 128-Beta Electronics Pro -Kit 1 PC Board Fabrication Kit 129-Kaypro 10 Hard -Disk Computer Radio -Electronics Annual is published yearly by Gernsback Publications, Inc., 200 Park Avenue South, New York, NY 10003. Single copies $2.50 plus $1.00 postage and handling for U.S., Canada and Mexico. U.S. funds only. All other countries add $2.00. C 1984 by Gernsback Publications, Inc. All rights reserved. Printed in U.S.A. As a service to readers, Radio -Electronics Annual publishes available plans or information relating to newsworthy products. techniques and scientific and technological developments. Because of possible variances in the quality and condition of materials and workmanship used by readers, Radio -Electronics Annual disclaims any responsibility for the safe and proper functioning of reader -built projects based upon or from plans or information published in this magazine. 2 Take home a world champion. S gets you a technical knockout. 85* The Fluke 70 Series. Winners of the digital vs. analog battle. Since their debut, they've become the worldwide champions of the industry. Never before have such tough, American - made meters offered so many professional features at such unbeatable prices. Each comes with a 3 -year warranty, 2,000+ hour battery life, and instant autoranging. You also get the extra resolution of a 3200 - count LCD display, plus a responsive analog bar graph for quick visual checks of continuity, peaking, nulling and trends. Choose from the Fluke 73, the ultimate in simplicity. The feature -packed Fluke 75. Or the deluxe Fluke 77, with its own protective holster and unique "Touch Hold" function** that captures and holds readings, then beeps to alert you. So don't settle for just a contender. Take home a world champion. For your nearest distributor or a free brochure, call toll -free anytime 1-800-227-3800, Ext. 229. From outside the U.S., call 1-402-496-1350, Ext. 229. FROM THE WORLD LEADER IN DIGITAL MULTIMETERS. FLUKE 73 FLUKE 75 FLUKE $85* $99' $129* Analog/digital display Analog/digital display Analog/digital display Volts, ohms, 10A, diode Volts, ohms, 10A, mA, Volts, ohms, 10A, mA test diode test diode test Autorange Audible continuity Audible continuity 0.7% basic dc accuracy Autorange/range hold "Touch Hold" function 2000+ hour battery life 0.5% basic dc accuracy Autorange/range hold 3-year warranty 2000+ hour battery life 0.3% basic dc accuracy 3 -year warranty 2000+ hour battery life 3 -year warranty Multipurpose holster Suggested U.S.